Acar adaptive connectivity aware routing for vehicular ad hoc networks vanet
Download
1 / 38

ACAR: Adaptive Connectivity Aware Routing for Vehicular Ad Hoc Networks VANET - PowerPoint PPT Presentation


  • 673 Views
  • Uploaded on

ACAR: Adaptive Connectivity Aware Routing for Vehicular Ad Hoc Networks (VANET). Qing Yang , Alvin Lim, Shuang Li, Jian Fang and Prathima Agrawal Auburn University. 17th International Conference on Computer Communication and Networks (ICCCN), 2008, St. Thomas, Virgin Island, US. Outline.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'ACAR: Adaptive Connectivity Aware Routing for Vehicular Ad Hoc Networks VANET' - daniel_millan


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Acar adaptive connectivity aware routing for vehicular ad hoc networks vanet l.jpg

ACAR: Adaptive Connectivity Aware Routing for Vehicular Ad Hoc Networks (VANET)

Qing Yang, Alvin Lim, Shuang Li, Jian Fang and Prathima Agrawal

Auburn University

17th International Conference on Computer Communication and Networks (ICCCN), 2008, St. Thomas, Virgin Island, US

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Outline l.jpg
Outline Hoc Networks (VANET)

  • Assumption

  • System model

    • Model of connectivity

    • Model of road quality

  • Routing algorithm

  • Simulation and result analysis

  • Related work

  • Conclusion

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Applications of vanet l.jpg
Applications of VANET Hoc Networks (VANET)

  • Vehicular safety

    • Collision warning

    • Accident notification

  • Vehicular commercial

    • Toll collection

    • Drive through auto pay

  • Traffic congestion control

  • Office-on-wheels

  • On-road advertisement

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Assumption l.jpg
Assumption Hoc Networks (VANET)

  • GPS on each vehicle

    • Standard component

  • Digital maps [1,2]

    • Vehicle density

    • Average speed

    • Traffic light period

1. http://www.mapmechanics/

2. http://www.yahoo.com/

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Outline5 l.jpg
Outline Hoc Networks (VANET)

  • Assumption

  • System model

    • Model of connectivity

    • Model of road quality

  • Routing algorithm

  • Simulation and result analysis

  • Related work

  • Conclusion

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Divide road into cells l.jpg

…. Hoc Networks (VANET)

n cars

m cells

Divide road into cells

  • One lane

    • road (length is L) is equally divided into m cells

    • each cell can contain only one node

    • communication range is size of n0 cells

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Number of empty cells l.jpg

…. Hoc Networks (VANET)

….

Number of empty cells

  • One lane

    • Number of empty cells is m-n

  • Multiple lanes

    • Number of lanes is n’

    • Number of empty cells ranges [m-n, m-n/n’]

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Number of empty cells8 l.jpg

…. Hoc Networks (VANET)

Number of empty cells

  • One lane

    • Number of empty cells is m-n

  • Multiple lanes

    • Number of lanes is n’

    • Number of empty cells ranges [m-n, m-n/n’]

1

0

0

1

1

0

1

2

0

1

1

1

1

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Probability of connectivity l.jpg
Probability of connectivity Hoc Networks (VANET)

  • P1 (existing exactly k empty cells)

  • P2 (existing more than n0continuous empty cells)

  • P (Probability of connectivity)

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Effect of traffic light l.jpg
Effect of traffic light Hoc Networks (VANET)

  • Node blocked on road A

  • Probability of moving from road A to D

  • Expected number of nodes moving from A to D

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Outline11 l.jpg
Outline Hoc Networks (VANET)

  • Assumption

  • System model

    • Model of connectivity

    • Model of road quality

  • Routing algorithm

  • Simulation and result analysis

  • Related work

  • Conclusion

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Packet error rate of single link l.jpg
Packet error rate of single link Hoc Networks (VANET)

  • Path loss model

  • SINR (Signal plus interference to noise ratio)

  • BER (Bit error rate)

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Per of single link cont l.jpg
PER of single link (cont’) Hoc Networks (VANET)

  • FER (Frame error rate)

  • PER (Packet error rate)

  • PER of certain road segment

Where N is the number of retransmission times,

FER = 1 – (1 – BER)^L, L is the number of bits per frame

Where t is the number of frames per packet

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Quliaty of road segments l.jpg
Quliaty of road segments Hoc Networks (VANET)

  • PER of road segments

  • Quality of road segments

Where P(u(n,m) = k} is the probability that there are exact k empty cells on the road with m cells

Where

Prs is the probability of connectivity of road segment

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Outline15 l.jpg
Outline Hoc Networks (VANET)

  • Assumption

  • System model

    • Model of connectivity

    • Model of road quality

  • Routing algorithm

  • Simulation and result analysis

  • Related work

  • Conclusion

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Routing strategy in brief l.jpg
Routing strategy in brief Hoc Networks (VANET)

  • Adaptively select the path Pr

  • On-the-fly collect the real-time density

  • Select next hop by minimizing the PER of whole path

  • Buffered packet if no available next hop

  • Send buffered packet until new next hop is in range

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Map transformation l.jpg
Map transformation Hoc Networks (VANET)

Q3

Q8

  • Qn: Quality of of road segment n

  • Each road segment n become a vertex n

Q1

Q11

Q6

Q4

Q9

Q1*Q4*Q7*Q12=Max?

Q2

Q7

Q12

Q5

Q10

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Path pr with best communication quality l.jpg
Path Pr with best communication quality Hoc Networks (VANET)

  • Modified Dijkstra Algorithm

    • Final goal: maximize the quality of the whole path

    • Each step: add one more edge, the quality of new path decrease

  • Can be computed

    • Centralized

    • Distributed

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Adaptive path selection l.jpg
Adaptive path selection Hoc Networks (VANET)

  • Reason: inaccurate density

  • Possible solutions

    • Flood to collect density

    • Too much overhead

  • Our solution

    • Adaptive path selection

    • collects density data while forwarding packets

    • Update density information

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


On the fly density collection l.jpg
On the fly density collection Hoc Networks (VANET)

  • Each forwarder add the local density into packet header

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Next hop selection l.jpg
Next hop selection Hoc Networks (VANET)

  • PER of link between A and B

  • Estimated PER of the path

  • Minimize the above value

Where Dis is the residual distance to the sink,

d is the distance between node A and B

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Carry and forward strategy l.jpg

Wisitpongphan, N.; Bai, F.; Mudalige, P.; Tonguz, O. K., "On the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

Carry and forward strategy

  • Buffer packets which can not be forwarded

  • Send out buffered packet if new next hop is available

  • Good for VANET

    • Lots of “holes” in VANET due to the traffic light

    • On path Pr, more chance to meet a new next hop

    • Big buffer is feasible in cars

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Outline23 l.jpg
Outline the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

  • Assumption

  • System model

    • Model of connectivity

    • Model of road quality

  • Routing algorithm

  • Simulation and result analysis

  • Related work

  • Conclusion

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Simulation l.jpg
Simulation the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

  • Node movement

    • VanetMobiSim (mobility trace)

    • Validation of model

  • Map

    • TIGER/LINE (real map)

    • Real map from Tennessee

  • Network simulation

    • Ns2 setup

    • Result analysis

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Vanetmobisim l.jpg
VanetMobiSim the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

3. http://vanet.eurecom.fr

  • Feature

    • multi-lane roads

    • separate directional flows

    • traffic signs at intersections

    • Intersection management

    • Lane changing

  • VanetMobiSim[3] mobility patterns have been validated against TSIS-CORSIM

    • a well known and validated traffic generator

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Validation of model l.jpg
Validation of model the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

  • Length of road

    • 1000m, 1800m

  • Traffic light period

    • 30sec., 60sec.

  • Average velocity

    • 7.5m/s, 10m/s

  • Map

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Connectivity model validation l.jpg
Connectivity model validation the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

  • Dataset1:1000m, 7.5m/s, 120sec of traffic light

  • Dataset2:1800m, 10m/s, 60sec of traffic light

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Map information l.jpg

4. the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007http://www.census.gov/geo/www/tiger/

5. http://www.triusinc.com/latest.htm

Map information

  • TIGER[4]

    • Topologically Integrated Geographic Encoding and Referencing

  • A format used by the United States Census Bureau to describe land attributes

    • Roads, buildings, rivers, and lakes

    • Can be read by Tivec[5]

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Map in simulation l.jpg
Map in simulation the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

  • Centered at

    • Long: -72530684

    • Lat: 42095405

    • Width: 2000m

    • Length: 2000m

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Ns2 setup l.jpg
Ns2 setup the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

  • Simulation Area: 2000m*2000m

  • Nubmer of nodes: 200

  • Communication range: 250m

  • Packet size: 512 Byte

  • CBR rate: 0.1 ~ 1packet/sec.

  • Random selected source and destination

  • Buffer size: 512kBytes

  • Beacon interval: 1.0 sec.

  • Velocity: 15 ~ 35 MPH

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Data delivery ratio l.jpg
Data delivery ratio the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Networking delay l.jpg
Networking delay the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Throughput l.jpg
Throughput the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Impact of density error l.jpg
Impact of density error the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Impact of density error cont l.jpg
Impact of density error (cont’) the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Impact of buffer size l.jpg
Impact of buffer size the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Related work l.jpg
Related Work the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

  • CAR (’08WCNC)

    • Connectivity aware routing

  • VADD (’06INFOCOM)

    • Vehicle-Assisted Data Delivery

  • MURU (’06MobiQuitous)

    • Multi-Hop Routing for Urban Vanet

  • GSR (’05MC2R)

    • Geographic source routing

  • GPSR (’00MobiCom)

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


Questions comments l.jpg
Questions & comments the Routing Problem in Disconnected Vehicular Ad-hoc Networks," INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE , vol., no., pp.2291-2295, May 2007

Thanks!

17th International Conference on Computer Communication and Networks, 2008, Virgin Island, US


ad